The General Electric GAU-8/A Avenger is a 30 mm, hydraulically-driven seven-barrel Gatling-type…
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An early problem with this gun/plane combo was that the gun was so big that every time it was fired, its exhaust gasses would get sucked into the plane's two engines, causing them to flameout and stall. The plane's engineers' solution was to set the engines' igniters (like their spark plugs) to come on every time the gun was fired.